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Optics Letters

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  • Vol. 30, Iss. 10 — May. 15, 2005
  • pp: 1096–1098

Geometrical phase image encryption obtained with space-variant subwavelength gratings

Gabriel Biener, Avi Niv, Vladimir Kleiner, and Erez Hasman  »View Author Affiliations


Optics Letters, Vol. 30, Issue 10, pp. 1096-1098 (2005)
http://dx.doi.org/10.1364/OL.30.001096


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Abstract

An optical encryption method based on a geometrical phase produced by space-variant polarization manipulation is presented. The decrypted picture is retrieved either by a polarization measurement of the beam emerging from the encrypted element or by a single intensity measurement of the beam transmitted through the encrypted element followed by an optical key element. Both elements are realized by use of computer-generated space-variant subwavelength dielectric gratings. Theoretical analyses of the optical concept are presented along with experimental results.

© 2005 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(260.5430) Physical optics : Polarization

Citation
Gabriel Biener, Avi Niv, Vladimir Kleiner, and Erez Hasman, "Geometrical phase image encryption obtained with space-variant subwavelength gratings," Opt. Lett. 30, 1096-1098 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-10-1096


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